﻿

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;
using Newtonsoft.Json;
using System;
using System.Text.RegularExpressions;

namespace cloudscribe.Web.Common.Extensions
{
    public static class HttpRequestExtensions
    {
        private const string RequestedWithHeader = "X-Requested-With";
        private const string XmlHttpRequest = "XMLHttpRequest";

        public static bool IsAjaxRequest(this HttpRequest request)
        {
            if (request == null)
            {
                throw new ArgumentNullException("request");
            }

            if (request.Headers != null)
            {
                return request.Headers[RequestedWithHeader] == XmlHttpRequest;
            }

            return false;
        }

        //regex from http://detectmobilebrowsers.com/
        private static readonly Regex b = new Regex(@"(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino", RegexOptions.IgnoreCase | RegexOptions.Multiline);
        private static readonly Regex v = new Regex(@"1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-", RegexOptions.IgnoreCase | RegexOptions.Multiline);

        public static bool IsMobileBrowser(this HttpRequest request)
        {
            var userAgent = request.UserAgent();
            if ((b.IsMatch(userAgent) || v.IsMatch(userAgent.Substring(0, 4))))
            {
                return true;
            }

            return false;
        }

        public static string UserAgent(this HttpRequest request)
        {
            return request.Headers["User-Agent"];
        }

        public static string PathAndQuery(this HttpRequest request)
        {
            return request.Path + request.QueryString;
        }

        public static string GetCurrentBaseUrl(this HttpRequest request)
        {

            return request.Scheme + "://" + request.Host.ToUriComponent();
        }

        public static string GetCurrentFullUrl(this HttpRequest request)
        {

            return request.Scheme + "://" + request.Host.ToUriComponent() + request.Path.Value;
        }

        public static string GetCurrentFullUrlWithQueryString(this HttpRequest request)
        {

            return request.Scheme + "://" 
                + request.Host.ToUriComponent() 
                + request.Path.Value
                + request.QueryString
                ;
        }

        public static bool SessionIsAvailable(this HttpContext context)
        {
            var feature = context.Features.Get<ISessionFeature>();
            return (feature != null);
        }

        public static T GetFromSession<T>(this HttpContext context, string key)
        {
            if(!context.SessionIsAvailable())
            {
                return default(T);
            }

            var value = context.Session.GetString(key);

            return value == null ? default(T) : JsonConvert.DeserializeObject<T>(value);
        }

        public static string GetFromSession(this HttpContext context, string key)
        {
            if (!context.SessionIsAvailable())
            {
                return null;
            }

            return context.Session.GetString(key);

        }

        public static string GetIpV4Address(this HttpContext context)
        {
            var connection = context.Connection;
            if (connection == null) return string.Empty; 
            var ip = connection.RemoteIpAddress;
            if (ip == null) return string.Empty;
            var ipv4 = ip.MapToIPv4();

            string ipv4Address = ipv4.ToString();
            return ipv4Address;
        }

        public static string GetIpV6Address(this HttpContext context)
        {
            var connection = context.Connection;
            if (connection == null) return string.Empty; ;
            var ip = connection.RemoteIpAddress;
            if (ip == null) return string.Empty;
            var ipv6 = ip.MapToIPv6();

            string ipv6Address = ipv6.ToString();
            return ipv6Address;
        }

    }
}
